WE302 that won't ring

[lnx64]

I got a Western Electric 302 on my side table next to my sitting chair in my office, but it has decided to stop ringing.

I've traced the problem down to the hook switches. The phone does go on-hook when hung up, but it seems the other contact is intermittent. I've tried to clean it, even deoxit the contacts, but it still will fail to ring.

More specifically, after cleaning, it works for a day or two, then I notice it'll start ringing late, or simply not at all.

Any ideas? Hoping there are some phone guys here too.

EDIT: And now, after 2 days of it not ringing, now it rings again. I'm at a loss here. If it rings late, it rings just fine until the phone is answered.